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1305005 = 513171181
BaseRepresentation
bin100111110100110101101
32110022010112
410332212231
5313230010
643545405
714043452
oct4764655
92408115
101305005
11811519
1252b265
13368cc0
1425d829
151aba05
hex13e9ad

1305005 has 16 divisors (see below), whose sum is σ = 1787184. Its totient is φ = 906240.

The previous prime is 1304987. The next prime is 1305011. The reversal of 1305005 is 5005031.

It can be written as a sum of positive squares in 8 ways, for example, as 21316 + 1283689 = 146^2 + 1133^2 .

It is not a de Polignac number, because 1305005 - 218 = 1042861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (111699).

21305005 is an apocalyptic number.

It is an amenable number.

1305005 is a deficient number, since it is larger than the sum of its proper divisors (482179).

1305005 is a wasteful number, since it uses less digits than its factorization.

1305005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 75, while the sum is 14.

The square root of 1305005 is about 1142.3681543180. The cubic root of 1305005 is about 109.2791710299.

The spelling of 1305005 in words is "one million, three hundred five thousand, five".

Divisors: 1 5 13 17 65 85 221 1105 1181 5905 15353 20077 76765 100385 261001 1305005